body,html{
    height: 100%;
    margin: 0;
    padding: 0;
}
.title_div{
    text-align: center;
    height: 20%;
    display: flex;
    justify-content: center;
}
.core_div{
    display: flex;
    justify-content: center;
    align-items: center;
}



form{
    border: 1px solid black;
    padding: 20px;
    border-radius: 20px;
    box-shadow: 10px 10px 10px gray;
}
form tr td:first-child {
    text-align: right;
}
form tr td {
    padding: 2px 5px;
}
.but {
    display: flex;
    justify-content: center;
    padding-top: 15px;
}
.but button{
    margin-right: 30px;
}
.error {
    color: red;
}
